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November 2003 © TOSHIBA TEC 5 - 71 e-STUDIO3511/4511 TROUBLESHOOTING
[CE20] Image quality sensor abnormality (no pattern level)
1. Check if the transfer belt or transfer belt unit are securely installed.
2. Check for any abnormal stain caused by poor cleaning, large flaw or break on the transfer belt
surface.
3. Check if the drum and the transfer belt are rotating. If any abnormality is found, correct any
mechanical problem.
Is the connectors CN345 on the LGC board disconnected?
Is the connector of the image quality sensor disconnected or the surface of the sensor stained?
Is the harness between the LGC board and the image quality sensor open circuited?
Is the shutter of image quality sensor opening and closing normally? Is the shutter damaged?
<Procedure>
1. Take off the transfer belt unit so that the image quality sensor unit can be easily
seen.
2. While pressing the digital keys [0] and [3] simultaneously, turn the power ON.
3. Key in “430”.
4. The shutter is opened and closed repeatedly by pressing the [START] button
repeatedly.
YES Connect the connector securely. Replace the harness. Clean the sensor.
Replace the shutter if it is damaged.
Replace the shutter solenoid if its operation is defective.
NO
Is the output voltage from the 12V-power supply normal?
NO Check the power supply system, and replace the switching power supply.
YES
1. Replace the image quality sensor.
2. Replace the LGC board.